Rename sequence_number to timestamp.

remoting/proto/video.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Protocol for video messages.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 37 matching lines @@
 
   // List of rectangles updated by this frame.
   repeated Rect dirty_rects = 6;
 
   // Time in milliseconds spent in capturing this video frame.
   optional int64 capture_time_ms = 7;
 
   // Time in milliseconds spent in encoding this video frame.
   optional int64 encode_time_ms = 8;
 
-  // The most recent sequence number received from the client on the event
-  // channel.
-  optional int64 client_sequence_number = 9;
+  // The client's timestamp of the latest event received by the host before
+  // starting to capture this video frame.
+  optional int64 latest_event_timestamp = 9;
 
   repeated Rect desktop_shape_rects = 10;
 
   // True when |desktop_shape_rects| should be used.
   optional bool use_desktop_shape = 11;
 
   // Optional frame timestamp. Used in tests to estimate frame latency.
   optional int64 timestamp = 12;
 }